Mahto In The Woods jumps over a small creek on foot while his cousin Jayden Lookinghorse jumps over on his horse on the Cheyenne River Reservation in Green Grass, South Dakota, U.S., May 31, 2018. REUTERS/Stephanie Keith SEARCH "KEITH ANNIVERSARY" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY.